To change how fast the FPS variable updates, slide the timer value to a number of your choice between 0 and 1. Then make sure you import both the FPS variable and the Timer variable (timer variable optional) and put it into your project. For strong performance you should be getting high 20s and low 30s once used in your project. The reason why its so high here is because nothing is going on in the background.
Check this great game out! : https://scratch.mit.edu/projects/64972776/ If you have any suggestions, feel free to post them in the comments!